Search

Your search keyword '"Lin, Kelian"' showing total 14 results
Start Over Author "Lin, Kelian"
14 results on '"Lin, Kelian"'

3. Engineering Symmetry Breaking Enables Efficient Bulk Spin‐Orbit Torque‐Driven Perpendicular Magnetization Switching.

Author

Chen, Lei, Zhang, Kun, Li, Bo, Hong, Bin, Huang, Wentao, He, Yu, Feng, Xueqiang, Zhang, Zhizhong, Lin, Kelian, Zhao, Weisheng, and Zhang, Yue

Subjects
MAGNETIZATION, SPIN-orbit interactions, SYMMETRY breaking, X-ray absorption, CRITICAL currents, ENGINEERS, FLUX pinning
Abstract

To overcome the interfacial nature of spin‐orbit torque (SOT) in bilayers, novel bulk SOT (BSOT) is widely investigated to implement high‐density and low‐power spintronic devices. However, the underlying mechanism of efficient BSOT switching remains unclear, especially the anomalously enhanced effective spin Hall angle (θSH) with increasing ferromagnet thickness (tFM), due to lacking simple and high‐tunable material systems. Here, a series of Pt/Co multilayers with invariable thickness gradient and varying stacking numbers is designed to systematically explore BSOT origin and enable efficient switching via engineering symmetry breaking. As tFM increases, the critical current density decreases while the switching efficiency and θSH build up. Comparative experiments directly demonstrate that gradient‐induced local spin current is more efficient than that in the bilayer. Moreover, x‐ray absorption spectroscopy (XAS) results reveal that the increasing stacking number can effectively engineer the symmetry breaking at Pt/Co interface to induce strong interfacial spin‐orbit coupling. On this basis, it is concluded that the BSOT effect, as well as the anomalously enhanced switching efficiency, and θSH arises from gradient‐induced bulk and interface symmetry breaking. These findings clarify the underlying mechanism of BSOT, and broaden the scope of material engineering to improve switching efficiency and inspire more memory and computing applications. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

5. Ultra-Fast True Random Number Generator Based on Ill-Posedness Nucleation of Skyrmion Bags in Ferrimagnets

Author

Zhang, Zhizhong, Lin, Kelian, Zhang, Kun, Feng, Xueqiang, Chen, Lei, Zhang, Youguang, Bournel, Arnaud, Klaui, Mathias, Zhao, Weisheng, and Zhang, Yue

Abstract

An ultra-fast true random number generator (TRNG) based on ill-posedness nucleation of skyrmion bags (sk-bags) with high topological charge (Q) is proposed and studied via numerical method. Under a local spin-polarized current, the ill-posed dynamics of ferrimagnetic spin texture is induced, resulting in the nucleation of sk-bag with high Q (even $\vert \text{Q}\vert >10$ ). Furthermore, in combination with thermal activation, this initially complex phenomenon can be tuned to possess a defined probability distribution of Q. Based on these, we reveal for the first time that the nucleation process of Q, in contrast to the dynamic motion of topological solitons, has the potential to provide an ultra-high true random number generation with a generation rate of 20 Gbit/s, which is the fastest record compared with previous spintronic TRNGs. Finally, we verified the functionality of the device through simulation and demonstrated its advantages in terms of power consumption. Our research provides an additional possibility for developing high-performance TRNG.

Published
2024
Full Text
View/download PDF

6. Ferrimagnets for spintronic devices: From materials to applications

Author

Zhang, Yue, primary, Feng, Xueqiang, additional, Zheng, Zhenyi, additional, Zhang, Zhizhong, additional, Lin, Kelian, additional, Sun, Xiaohan, additional, Wang, Guanda, additional, Wang, Jinkai, additional, Wei, Jiaqi, additional, Vallobra, Pierre, additional, He, Yu, additional, Wang, Zixi, additional, Chen, Lei, additional, Zhang, Kun, additional, Xu, Yong, additional, and Zhao, Weisheng, additional

Published
2023
Full Text
View/download PDF

11. Magnon scattering modulated by omnidirectional hopfion motion in antiferromagnets for meta-learning.

Author

Zhizhong Zhang, Lin, Kelian, Yue Zhang, Bournel, Arnaud, Ke Xia, Kläui, Mathias, and Weisheng Zhao

Subjects
*SUPERCONDUCTING magnets, *SPIN waves, *SPIN transfer torque, *DEGREES of freedom, *STANDARD deviations
Abstract

The article presents a neural network based on magnon scattering modulated by an omnidirectional mobile hopfion in antiferromagnets, including the connections between neurons are related to the frequency dependence of magnon scattering, which allows for high connection density and meta-learning. It also mentions that the proposed design could break the connection density bottleneck in neuromorphic computing and provide a guideline for future design.

Published
2023
Full Text
View/download PDF

12. Efficient and controllable magnetization switching induced by intermixing-enhanced bulk spin–orbit torque in ferromagnetic multilayers

Author

Zhang, Kun, primary, Chen, Lei, additional, Zhang, Yue, additional, Hong, Bin, additional, He, Yu, additional, Lin, Kelian, additional, Zhang, Zhizhong, additional, Zheng, Zhenyi, additional, Feng, Xueqiang, additional, Zhang, Youguang, additional, Otani, Yoshichika, additional, and Zhao, Weisheng, additional

Published
2022
Full Text
View/download PDF

13. 3D Ferrimagnetic Device for Multi-Bit Storage and Efficient In-Memory Computing

Author

Zhang, Zhizhong, primary, Zheng, Zhenyi, additional, Zhang, Yue, additional, Sun, Jinyi, additional, Lin, Kelian, additional, Zhang, Kun, additional, Feng, Xueqiang, additional, Chen, Lei, additional, Wang, Jinkai, additional, Wang, Guanda, additional, Du, Yinchang, additional, Zhang, Youguang, additional, Bournel, Arnaud, additional, Amiri, Pedram Khalili, additional, and Zhao, Weisheng, additional

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results